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<a name="boost.mpi.request"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Class request</span></h2>
<p>boost::mpi::request &#8212; A request for a non-blocking send or receive. </p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../mpi/reference.html#header.boost.mpi.request_hpp" title="Header &lt;boost/mpi/request.hpp&gt;">boost/mpi/request.hpp</a>&gt;

</span>
<span class="keyword">class</span> <a class="link" href="request.html" title="Class request">request</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="comment">// <a class="link" href="request.html#boost.mpi.requestconstruct-copy-destruct">construct/copy/destruct</a></span>
  <a class="link" href="request.html#idp44206816-bb"><span class="identifier">request</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="request.html#idp44202496-bb">public member functions</a></span>
  <a class="link" href="status.html" title="Class status">status</a> <a class="link" href="request.html#idp44202704-bb"><span class="identifier">wait</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <span class="identifier">optional</span><span class="special">&lt;</span> <a class="link" href="status.html" title="Class status">status</a> <span class="special">&gt;</span> <a class="link" href="request.html#idp44203776-bb"><span class="identifier">test</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">void</span> <a class="link" href="request.html#idp44206080-bb"><span class="identifier">cancel</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp119488480"></a><h2>Description</h2>
<p>This structure contains information about a non-blocking send or receive and will be returned from <code class="computeroutput">isend</code> or <code class="computeroutput">irecv</code>, respectively. </p>
<div class="refsect2">
<a name="idp119489648"></a><h3>
<a name="boost.mpi.requestconstruct-copy-destruct"></a><code class="computeroutput">request</code> 
        public
       construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><a name="idp44206816-bb"></a><span class="identifier">request</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Constructs a NULL request. </p>
</li></ol></div>
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<div class="refsect2">
<a name="idp119492736"></a><h3>
<a name="idp44202496-bb"></a><code class="computeroutput">request</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a class="link" href="status.html" title="Class status">status</a> <a name="idp44202704-bb"></a><span class="identifier">wait</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Wait until the communication associated with this request has completed, then return a <code class="computeroutput">status</code> object describing the communication. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">optional</span><span class="special">&lt;</span> <a class="link" href="status.html" title="Class status">status</a> <span class="special">&gt;</span> <a name="idp44203776-bb"></a><span class="identifier">test</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Determine whether the communication associated with this request has completed successfully. If so, returns the <code class="computeroutput">status</code> object describing the communication. Otherwise, returns an empty <code class="computeroutput">optional&lt;&gt;</code> to indicate that the communication has not completed yet. Note that once <code class="computeroutput">test()</code> returns a <code class="computeroutput">status</code> object, the request has completed and <code class="computeroutput">wait()</code> should not be called. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idp44206080-bb"></a><span class="identifier">cancel</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Cancel a pending communication, assuming it has not already been completed. </p>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2005-2007 Douglas Gregor,
      Matthias Troyer, Trustees of Indiana University<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">
        http://www.boost.org/LICENSE_1_0.txt </a>)
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